Fig. 2

Example of measurement of left atrial (LA) phasic deformation function by feature tracking (A): the LA contours were semi-automatically delineated with manual adjustment at the phase of left ventricular (LV) end-systole and end-diastole on the two- and four-chamber cine images. Curves of feature tracking-derived LA strain and strain rate in different phases during the cardiac cycle in a healthy participant (B)